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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642665db3f1bc91bcf6a3ffe1d4bf1b392470bd324784a29b4b4352960ddc73e' 
  AND token = 'B9E67QSIn8K8HorwOL/VChJCc2Fx6amcK2ScLsRZBOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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