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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbf80114334c026f5b41dd56d5446ed42474ac99a7f2dbccc7e2c54e8ea4a16' 
  AND token = 'HO9ocgXd1iHgcG/A2ivdE6gtA6XnS6VGczf0PaQN3tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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