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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c83bdbf291274696d5012863e458c4b6a2040f513387b492cf5ef4c7b370d0' 
  AND token = 'FIcI+GIjjIi2HM1eMet/N5Ctzh9szUEpuV4b2RW87C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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