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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835ce336bcd31cb64a3e595b1bc84a9e0ec9089b9af68aabefde9db16377c42a' 
  AND token = 'py07tYkzj0X/P3jBhl/b68gJRTQaq38K6uw254q/YJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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