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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f829f2ff1ac17f3bb5fa6095c035fd1ffc977df6df961d82faa5f6f7deff437' 
  AND token = 'MUjWJpO1bUonUz/GCDmUZ6tmmQwgIP1UG1P2GjE1fSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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