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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470d0758c4e312ec8269f44227ff49a26d2276e36e1f22ed960c489d20c4a73b' 
  AND token = 'Q8VRo3fX+Nq2/BROlCdWtHJRTKvgc7v68THQASW1eBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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