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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799cd1e2418f80a8ecad9db6ef2e6a2d516b67bc40317b35bad0226ce26b7c62' 
  AND token = 'yeAZg1WhrPlbXAvdiCjobfSgLw0igNnWuX92Ri0x1/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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