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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ca832a7500077669eadd771ada9496c556c2337f0a8b6301223e7a6851ed9b' 
  AND token = 'hZ62AFae4dG6g3EAikXR6f6YHnYjGMFq1XW9pMqJkuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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