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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a737dc2c55f28d79684b2f1357c10d5f518149f8c0b02a2e70f0117634a81c4a' 
  AND token = 'AXAam/WNwdCQ2VgL82k6ml7oE42RkqIkiZYpIkiGlJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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