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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976f7281b20226a04a96eaac3a6839fa438b3159ccfbf0f8862de7185a4e4a3a' 
  AND token = 'uIi+qEFQc4JA2UkS50pN76Q5+GXclky/KjdGKGapQYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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