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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8e51f682989da76f764200e322e93ca70b8452d15065b9d9679be4c0e8f1aa' 
  AND token = 'aZkGducPVWavSu5XCaAJX69Q/uKDwYfvFD6oJc/erhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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