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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3da4dae782e105eb8170f3a602b77f9fb39d0dfa8b794bd60f7e41b814972be' 
  AND token = 'DM8YQ9jZOWcYexnJIgE7DOJvN+KQc+Q2cph5k/ca6oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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