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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ba746fc078e99a63a98c317590541f1e6db03db9acb1324726e123ea9c3c6a' 
  AND token = 'hQ+dt14ppx9QuaiRvjJIxrz0bPJxcjceAAfRDgi73DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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