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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87bb9cad83f7ea7b44d191465689a225e501c9c21d010a55237ff0d57cdb30d' 
  AND token = 'uoHKc02bVXFMAi06MBL8Gh7bm34AkfZAyxaR6r+Wwko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00839

JSON explain

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