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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91f6f38d40a6b3beeb5d0a14680d0700fed5ac97e13ce4f59b209d19e3a5eb2' 
  AND token = 'dDgAyTb7pxfO9w0p7NPUk2D1DL3pMoYQvx2YI7qp9O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}