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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e26d4f4f1b3dbaae133da7a19d01beca0455ac6aa170f5da326eccdfd24660' 
  AND token = 'Ok9P5rCI45DNZad1dw2YIL8KdCu29A6Sqa1Gn6bIkD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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