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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e02a174c39c97feeeca9fe796e85324abaf5639ee44b5ce1a7ce9b62b6834f' 
  AND token = '0CfgeatqTHmd7hPBZXS1n4YuypzLGBP6HNz8bUFgM7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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