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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da66fdb80fc38e31aafb03c8bf5151c654d000a6d426353a1e21d87d736086cc' 
  AND token = 'raP8ZkCvABp9w/OxbCyJYyxtLySmeky5tn8oSJYbF7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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