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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76392ab7efcfaba4907c6def750b7b3f89ac466c69956f09ec3f590e0896ef04' 
  AND token = 'KOeY7zBNHIv06h2oWUBWMEP+y1wtZzVWIQmwrGlWxV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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