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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9986c3a9197e70a1ef7241049c4d283255845e58101fef01438a4c497161ff0' 
  AND token = 'kHiM1UMvWboZntScZf2cGXS3dWrAHS/WJSivrr7IKaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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