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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576ce6c5b95494869ed0dbbd41acf0f59ca23a66b167bbc23d6ee06086406dd5' 
  AND token = '0odzQP37QyVdYcsYyi7Z9Xb3CLfrYMfh73g64oOwKok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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