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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea4b3e0b8275bbaa83765b0f1380396bc06eabe53c3dc35eb7ad243d13e0a6e' 
  AND token = 'X9vsKdAUNvBHAh9yAH7GsMKSwmz4QpM5ODRK230/WkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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