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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067ef8819be658559ae1341bdd18a0663151ba2c6cb397df6fe9061e7a7d71a7' 
  AND token = 'g3PeJAaYQWHkJjq6RdtQw3eJwp4VyntbS6318KQrzyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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