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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0330111229ce0a862e9f85c24389d921c2f3ce0f65da55c3010599e9846ca1' 
  AND token = 'Bn2Kk99AXiuy9yXDCiEN6cHh8NJqXcJ8djUdGFthY8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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