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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038dd4aaad835f2b2d47f4ac880e169c0ae81e85d251b7fdb4667de996712e6f' 
  AND token = '5Coizgg9+kkRvUeID6ytcvS66JpuFAiC/JcJoYw47LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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