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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298c804966251aa019c0dc2cb639812d714b03f71f0e3b29adcb279903e6d38a' 
  AND token = 'rCPHGphtvH5oK7Du7oZnfoMNXZuNLXv+zjdY6aLd7ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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