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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4462f0ab9a3afb9961fb47ca4acedb048810a05b818297e494d80d1163ffc04b' 
  AND token = '08ou8GQ3SGg8nqSd/isOpzVGk0v/l5XOjqz8hPCYVSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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