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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fa379cc860a6763b941d33ca173e3692726bcfb3718b8c59e0e5180081b8ca' 
  AND token = 'MFJVv7Yx57jnCgoR9JCtYLR5TtSesvRLPe33mrRut6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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