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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aea6563b5d78db6c47538ec75b5cc27b493ed317c13b32035af6a103da4663d' 
  AND token = 'hVsd0a4RllVqVG6vB17irtMOeXx1jWgRNEqPgaamVGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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