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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418593f7dd36028cc884749ae7b741468b924f7cc49d7ee54fc81d69251b5069' 
  AND token = 'jVlzzyvxO2iuEjlbsR6WIHyJ1GyY7XylIpHbTc/ycO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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