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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe94c0605c3a6075d6f5842dfa7e8b2b9dc5963b78efa546d445a697eac3fa7f' 
  AND token = 'MWKYUBQ2d4QNHw6svcWTg5ANyME4x2WqwhB3LW+e+sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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