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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ededc6d3408c76f97bd1d13b5ee53aaad4576a353963071b0e0d641dd157b86' 
  AND token = 'LXzfhP3fDBqsL/QO2rVdrnpeb9xMOOyZ/LZnTak08SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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