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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a69bb321f0805339406efbbf0bb490102eaf3de8297928b33987e642a51dd74' 
  AND token = 'HaRJsk//+Wmtq+pUOH08FNV3cIwrELfG/Z1pJLIsU58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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