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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd04a26a2be407062ca07c614e1bdac46717460b8d5b1f125e38f4c6b19e998c' 
  AND token = 'WWcdzuN4kMa6CcdcWdtlBYrRsvJEbAsjLj+75GThbfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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