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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f099b04bb8f355f63621059b5c855d1310ee8a9505172f641a73cbcb90753460' 
  AND token = 'uqov1+ZGC8SLKe+1q49Qv/bpX7vPt1TyifCmZji9a6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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