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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07645946538767914e9466118d2ee0f41a91734f864730485809e942dac20cb' 
  AND token = 'GmeU08tGoJs2LVu6q9x4Dt6del9e2NGhgJ0so4c5IEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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