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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc25130b70b25da6bea421760291f27d7acf7b780a1d94d2d286da8f4d8c3688' 
  AND token = 'KpJnP3dxiXOR49YNEgXrQD9HjiJFmaSeZIVzR7ARx4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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