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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0f1d72647d3221bdba13f5e5752e8fd3df5c56f359911ce073a9e99bc1afcc' 
  AND token = 'OWIJSOKgJx4wt8x3fhhe5bsWJ2+bRI5QDjUhM3FoIss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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