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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3745c955658605648ef02e05788f879464867cea1ec97e80033377df3178f8cd' 
  AND token = 'NGGoA15bIpMwly7SG/4mmUnW2F+PV9FcQpt63aM1/Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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