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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32e7c19a7f35f447805d38770c90c964eeca4559ba3f8bfd9ef194127febfbc' 
  AND token = '6qGcacZNpbp84diVcl/7L2OpRMK1z8ySrtkTtHX/X9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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