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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ee96f6b3c7c215b28c6c603ff633daa5557a255c23fd51d34dcda2acb3f5dc' 
  AND token = 'JqRYLUrPRdVpeOOCPGyB54ykQ+CpQ7qkCuLS7ZXZnzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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