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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3bbda49a190cd79cfa613a799de587eadbb97575906de2a2b2d0effbcb9c1b' 
  AND token = 'ttaM7m6LkamBrZIme2lCGl+W88dZmUlXuBPpYAtLVQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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