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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6998563449489f856798d3e4f84ac0e0a2180d89e5e76a1cbd67194655005a' 
  AND token = 'SC1dJBiH616BrfL/S07FviEh6TvnX1o2h9/p21AGeQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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