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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6c8be8e5e92acd19e4a68317018acdffada82db7fe8fabb6aa674b0bd6929d' 
  AND token = 'pqcpsad6ayL5vom3RRMSLyudKZyN4PRjD4+yaasRz3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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