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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b201822af5fb1a2017f1c216c5fc24ecee33e0c1c9e3f096ad82f9909866a970' 
  AND token = 'UFi4saVCKiYfOhAIi0C7bDsu+M1f22XRu5i2ALGLF08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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