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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734ebe985489d7f814704fface82341ea57f9b287fbeb71eb95e55be0fb6c31e' 
  AND token = 'ti1Lh6kdWCnDHX4tbXJYQM1amvCvo72emx4JH/MN9A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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